-------------------------------- Code implementation asynchronous return --------------------------------------------
Key page code
<Body>
<Form ID = "form1" runat = "server">
<Asp: scriptmanager id = "scriptmanager1" runat = "server">
</ASP: scriptmanager>
<Asp: updatepanel id = "updatepanel1" runat = "server" updatemode = "Conditional">
<Contenttemplate>
<% = Datetime. Now %>
<Asp: button id = "button2" runat = "server" text = "button"/>
</Contenttemplate>
</ASP: updatepanel>
<Asp: button id = "button1" runat = "server" text = "button" onclick = "button#click"/>
</Form>
</Body>
Background code
Public partial class demo2_api: system. Web. UI. Page
{
Protected void page_load (Object sender, eventargs E)
{
// Enable asynchronous callback of button1 (and button1 is not in updatepanel)
Scriptmanager. getcurrent (this). registerasyncpostbackcontrol (this. button1 );
// Enable button2 to trigger synchronous return (and button2 is in updatepanel)
Scriptmanager. getcurrent (this). registerpostbackcontrol (this. button2 );
}
Protected void button#click (Object sender, eventargs E)
{
This. updatepanel1.update (); // update the content in updatepanel1.
}
}
-------------------- Javascript script --------------------------- pops up during asynchronous callback -----------------------
Key page code
<Body>
<Form ID = "form1" runat = "server">
<Asp: scriptmanager id = "scriptmanager1" runat = "server">
</ASP: scriptmanager>
<Asp: updatepanel id = "updatepanel1" runat = "server">
<Contenttemplate>
<% = Datetime. Now %>
<Asp: button id = "button1" runat = "server" text = "button" onclick = "button#click1"/>
</Contenttemplate>
</ASP: updatepanel>
<Asp: updatepanel id = "updatepanel2" runat = "server">
<Contenttemplate>
<% = Datetime. Now %>
</Contenttemplate>
</ASP: updatepanel>
</Form>
</Body>
Background code:
Public partial class demo5_scriptmanagerreg: system. Web. UI. Page
{
Protected void page_load (Object sender, eventargs E)
{
}
Protected void button1_click1 (Object sender, eventargs E)
{
// The Javascript script pops up when updatepanel1 is updated.
Scriptmanager. registerstartupscript (this. updatepanel1, this. GetType (), "updatepanel1", "alert (1)", true );
// The Javascript script pops up when updatepanel2 is updated.
Scriptmanager. registerstartupscript (this. updatepanel2, this. GetType (), "updatepanel2", "alert (2)", true );
}
}
----------------------- Use the code (create updatepanel) to achieve Ajax effect -----------------------------
Page code:
<Body>
<Form ID = "form1" runat = "server">
<Asp: scriptmanager id = "scriptmanager1" runat = "server">
</ASP: scriptmanager>
</Form>
</Body>
Background code:
Public partial class demo7_programicupdatepanel: system. Web. UI. Page
{
Protected void page_load (Object sender, eventargs E)
{
Updatepanel up = new updatepanel ();
Up. ID = "updatepanel1 ";
This. Form. Controls. Add (up );
Literalcontrol lc = new literalcontrol (datetime. Now. tostring ());
Up. contenttemplatecontainer. Controls. Add (LC );
Button BTN = new button ();
BTN. Text = "refresh ";
Up. contenttemplatecontainer. Controls. Add (BTN );
}
}
------------------ Ajax asynchronous update error handling -----------------------------------------------------
You can use the onasyncpostbackerror event and asyncpostbackerrormessage attribute of the scriptmanager control to capture and set the error message during callback.
Example:
Page code:
<Body> <br/> <Form ID = "form1" runat = "server"> <br/> <div> <br/> <asp: scriptmanager id = "scriptmanager1" runat = "server" onasyncpostbackerror = "scriptmanagerpolicasyncpostbackerror"> <br/> </ASP: scriptmanager> </P> <p> </div> <br/> <asp: updatepanel id = "updatepanel1" runat = "server"> <br/> <contenttemplate> <br/> <asp: textbox id = "textbox1" runat = "server" width = "56px"> </ASP: textbox> <br/> <asp: label id = "label1" runat = "server" forecolor = "darkviolet" text = "+" width = "13px"> </ASP: Label> <br/> <asp: textbox id = "textbox2" runat = "server" forecolor = "darkorchid" width = "67px"> </ASP: textbox> <br/> <asp: button id = "button1" runat = "server" onclick = "button#click" text = "computing"/> <br/> <asp: label id = "label2" runat = "server" forecolor = "#0000c0" text = "label"> </ASP: label> <br/> </contenttemplate> <br/> </ASP: updatepanel> <br/> </form> <br/> </body>
Background code:
Public partial class updatepanelerrormessage: system. Web. UI. Page
{
Protected void page_load (Object sender, eventargs E)
{
}
Protected void button#click (Object sender, eventargs E)
{
Try
{
Double A = convert. todouble (textbox1.text. Trim ());
Double B = convert. todouble (textbox2.text. Trim ());
Double res = A * B;
Label2.text = res. tostring ("F3 ");//Control the output string format
}
Catch (exception ex)
{
If (textbox1.text. length> 1 & textbox2.text. length> 1)
{
Ex. Data ["CuO"] = "the two numbers cannot be multiplied! ";
}
Throw ex;
}
}
Protected void scriptmanagerpolicasyncpostbackerror (Object sender, asyncpostbackerroreventargs E)
{
If (E. Exception. Data ["CuO"]! = NULL)
{
Scriptmanager1.asyncpostbackerrormessage = E. Exception. Data ["CuO"]. tostring ();
}
Else
{
Scriptmanager1.asyncpostbackerrormessage = E. Exception. message;
}
}
}
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